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The time duration from 12am (midnight) to 4pm is exactly 16 hours, which equals 960 minutes or 57600 seconds.
12am (midnight) to 4pm spans 16 hours. These early morning hours are often a quiet time when most people are asleep.
The calculator above automatically sets the times to 12am (00:00) and 4pm (16:00), but you can adjust the date or add seconds for more specific calculations.